object ListDemo {
  def main(args: Array[String]): Unit = {
    val initialActivities = List("Python入门讲座","算法竞赛培训")
    val allActivities = "Scala集合实践" :: initialActivities
    println("编程社团活动列表:")
    for (activity <- allActivities) {
      println("- " + activity)
    }
    println(s"共${allActivities.size}场活动")
  }
}
